Sale! Add to cart Treat Underarm Sweat with Botox $1,000.00 $950.00 Purchase this treatment online and receive 5% off instantly! Botox injections contain onabotulinumtoxinA (a natural protein) that temporarily block the chemical responsible for activating sweat glands under the arm. Studies show that patients who have been treated for excessive underarm sweating using Botox have a 82-87% decrease in underarm sweating. Results typically last 1 year.